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Finding the Fourth Proportional to 30.91, 42.66 and 19.26

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Solution

The fourth proportional to 30.91, 42.66 and 19.26 is: 26.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.91 : 42.66 = 19.26 : x
  2. Step 2: Convert to fraction form
    30.91/42.66 = 19.26/x
  3. Step 3: Cross multiply
    30.91x = 42.66 × 19.26
  4. Step 4: Simplify right side
    30.91x = 821.63
  5. Step 5: Solve for x
    x = 821.63/30.91
  6. Step 6: Final answer
    x = 26.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.